brainvisa parameter change

Questions about BrainVisa usage and installation

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joost
Posts: 86
Joined: Tue Feb 05, 2008 1:56 pm

brainvisa parameter change

Post by joost »

Hi,

aim: to measure sulcal depth in a group of patients and controls.

question: if i increase the "pressure" when doing "compute cortex image" in _some_ brains in my sample BUT NOT in other brains in my sample, will this differentially affect measures such as "sulcal depth"? I mean: if i change the parameter "pressure", i should apply it to ALL of the subjects in my sample, not to a subsample only, is this correct?

merci,
-joost
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Jean-Francois Mangin
Posts: 337
Joined: Mon Mar 01, 2004 10:24 am
Location: Neurospin, CEA, France
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Re: brainvisa parameter change

Post by Jean-Francois Mangin »

Honestly, this issue could deserve some experiment, but I do not think
the sulcus depth would be changed by this parameter. This pression was mainly introduced to
slightly improve the grey/white matter interface, which is far to be the strongest point in
Morphologist because it is only a byproduct of our sulcus segmentation process.
In fact this interface is only initializing the processus computing the skeleton or medial axis
leading to the sulci. I do not think the final result is dependent on the variations resulting
from the pression parameters. But this is worth an experiment with one brain...
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